code: def step_impl_save_dataset_to_png(context):
      """Run Scene.save_dataset to create a PNG image.
  
      Args:
          context (behave.runner.Context): Test context
  
      """
      context.filename = "/tmp/test_dataset.png"
      context.scene.save_dataset("MyDataset", context.filename)
  
file_path: satpy/satpy/tests/features/steps/steps-save.py
imports: from unittest.mock import patch
  from behave import given, then, use_step_matcher, when
label_desc: Use image node_id 4 for calling a global function with example usage: step_impl_save_dataset_to_png(context) without return types